package Servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public abstract class BaseServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("UTF-8");
        String action = req.getParameter("action");
        Method method = null;
        try {
            //获取action业务鉴别字符串，获取相应的业务 方法反射对象
            method = this.getClass().getDeclaredMethod(action, HttpServletRequest.class, HttpServletResponse.class);
        } catch (NoSuchMethodException e) {
            throw new RuntimeException(e);
        }
        try {
            //调用目标业务 方法
            method.invoke(this,req,resp);
        } catch (IllegalAccessException | InvocationTargetException e) {
            throw new RuntimeException(e);
        }

    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req,resp);
    }
}
